Use termion buffered backend to avoid dependency from cursive

There are some issues with depeendency from the ncurses library, it does
not allows to compile chdig in a static binary (this could be done, but
requires some work), and this leads to a requirement for minimal glibc
version, recently I tried to run chdig on debian buster, and it fails:

    $ chdig
    chdig: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.29' not found (required by chdig)
    chdig: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.29' not found (required by chdig)

    # apt-cache policy libc6
    libc6:
      Installed: 2.28-10+deb10u2
      Candidate: 2.28-10+deb10u2
      Version table:
     *** 2.28-10+deb10u2 500
            500 http://security.debian.org/debian-security buster/updates/main amd64 Packages
            100 /var/lib/dpkg/status
         2.28-10+deb10u1 500
            500 http://deb.debian.org/debian buster/main amd64 Packages

Last time I've tried other backends, they all experience flickering
issues [1], but, cursive_buffered_backend [2] - solves the problem!

  [1]: gyscos/cursive#142
  [2]: https://github.com/agavrilov/cursive_buffered_backend

Also I have to remove --mouse/--no-mouse, since for this the cursive
should be patched.

Cargo.toml

@@ -37,8 +37,8 @@ warp = "*"
 clap = { version = "*", features = ["derive", "env"] }
 clap_complete = { version = "*" }
 # UI
-ncurses = "*"
-cursive = "*"
+cursive = { version = "*", features = ["termion-backend"] }
+cursive_buffered_backend = "0.6.1"
 cursive-syntect = "*"
 cursive_table_view = "0.14"
 # Patches:

src/interpreter/flamegraph.rs

@@ -1,7 +1,7 @@
 use crate::interpreter::clickhouse::Columns;
 use anyhow::{Error, Result};
 use futures::channel::mpsc;
-use ncurses;
+// use ncurses;
 use std::io::Write;
 use std::process::{Command, Stdio};
 use tempfile::NamedTempFile;
@@ -61,7 +61,7 @@ pub fn show(block: Columns) -> Result<()> {
         }
 
         // After tfg arrows stops working, fix it:
-        ncurses::keypad(ncurses::stdscr(), true);
+        // ncurses::keypad(ncurses::stdscr(), true);
         // If something else will not work take a look at [1].
         //
         //   [1]: https://github.com/gyscos/cursive/blob/1a0cc868b41232c0d5290a11b4b987ffed757798/cursive/src/backends/curses/n.rs#L115
@@ -128,7 +128,7 @@ pub async fn open_in_speedscope(block: Columns) -> Result<()> {
             )));
         }
 
-        ncurses::keypad(ncurses::stdscr(), true);
+        // ncurses::keypad(ncurses::stdscr(), true);
 
         // TODO: correctly wait the server stopped serving
         server.await;

src/interpreter/options.rs

@@ -119,12 +119,7 @@ pub struct ViewOptions {
     #[arg(long, default_value_t = false)]
     /// Do not accumulate metrics for subqueries in the initial query
     pub no_subqueries: bool,
-
-    #[arg(short('m'), long, action = ArgAction::SetTrue, default_value_t = true)]
-    /// Mouse support (turned on by default)
-    pub mouse: bool,
-    #[arg(short('M'), long, action = ArgAction::SetTrue, overrides_with = "mouse")]
-    no_mouse: bool,
+    // TODO: --mouse/--no-mouse (see EXIT_MOUSE_SEQUENCE in termion)
 }
 
 #[derive(Args, Clone)]
@@ -347,11 +342,6 @@ fn adjust_defaults(options: &mut ChDigOptions) {
     if options.view.no_group_by {
         options.view.group_by = false;
     }
-
-    // FIXME: apparently overrides_with works before default_value_t
-    if options.view.no_mouse {
-        options.view.mouse = false;
-    }
 }
 
 // TODO:

src/main.rs

@@ -1,7 +1,6 @@
 use anyhow::Result;
 use backtrace::Backtrace;
 use flexi_logger::{LogSpecification, Logger};
-use ncurses;
 use std::panic::{self, PanicInfo};
 
 mod interpreter;
@@ -29,9 +28,8 @@ fn panic_hook(info: &PanicInfo<'_>) {
         // - trim panic frames
         let stacktrace: String = format!("{:?}", Backtrace::new()).replace('\n', "\n\r");
 
-        ncurses::noraw();
-        ncurses::clear();
-        ncurses::refresh();
+        // FIXME: restore the terminal back from raw mode (see Backend::drop for termion)
+
         print!(
             "thread '<unnamed>' panicked at '{}', {}\n\r{}",
             msg, location, stacktrace
@@ -41,10 +39,13 @@ fn panic_hook(info: &PanicInfo<'_>) {
 
 #[tokio::main(flavor = "current_thread")]
 async fn main() -> Result<()> {
-    let mut siv = cursive::default();
+    let backend = cursive::backends::termion::Backend::init()?;
+    let buffered_backend = Box::new(cursive_buffered_backend::BufferedBackend::new(backend));
+    let mut siv = cursive::CursiveRunner::new(cursive::Cursive::new(), buffered_backend);
 
     // Override with RUST_LOG
     // NOTE: hyper also has trace_span() which will not be overwritten
+    // FIXME: "flexi_logger has to work with UTC rather than with local time, caused by IndeterminateOffset"
     let mut logger = Logger::try_with_env_or_str(
         "trace,cursive=info,clickhouse_rs=info,skim=info,tuikit=info,hyper=info",
     )?
@@ -62,14 +63,6 @@ async fn main() -> Result<()> {
         panic_hook(info);
     }));
 
-    if !context.lock().unwrap().options.view.mouse {
-        siv.cb_sink()
-            .send(Box::new(move |_: &mut cursive::Cursive| {
-                ncurses::mousemask(0, None);
-            }))
-            .unwrap();
-    }
-
     log::info!("chdig started");
     siv.run();